Wilson sailed with his family for his Sixth Expedition to the Far East, beginning in 1917. His collection notebooks from this time are digitized and available in Series W.VII: Wilson’s Sixth Expedition to the Far East—Japan, Korea, Manchuria, Formosa, and Islands in the Japanese Sea, January 1917-March 1919 of Ernest Henry Wilson (1876-1930) papers, 1896-1952.